If you are having trouble finding your Windows 10 license key, know that you are not alone. Sometimes, it feels like it is just hidden.
To find your product key, check out this great post at https://www.groovypost.com/howto/find-your-windows-10-product-key/.
The important paragraph is:
“When you purchase your Windows 10 license from the Microsoft Store, a copy of the product key is stored in your Microsoft Account. Microsoft will also send you a copy of the product key in a confirmation email. If you don’t see the confirmation email, check your junk mail folder. If you still don’t find it, log into the Microsoft Store > Downloads > Product Keys > Subscription page. Then click the Digital Content tab to see your previous purchases along with your product key.”